Danny D. wrote, on Wed, 01 Oct 2014 11:09:36 +0000:

BTW, today we devised a (potentially ingenious) method to *level* the
two cables.

I couldn't snap a picture because we were installing WiFi rooftop radios
most of the day and I was using the cell phone for signal strength and
interference observations, so the battery had died by the time we got to
the treehouse.

However, I'll explain in words, and later snap a picture for you, as to
how we devised a "tool" to measure the respective cable sag.

Sorry it took me so long.

Here's a picture of the method we used to level the two 100 foot cables:
https://c4.staticflickr.com/4/3948/1...606db7b4_b.jpg

We basically made a ten-foot wide T-square, where we used a level on the
vertical bar to measure how level the two cables were.

If they weren't so high off the ground on the very steep slope, we'd just
hang a lead weight from the midpoint of each cable, with an even length
of rope for each cable - but we preferred to work at the only *flat* part
along the entire 100 foot length of the two cables.

It was really difficult working in the trees to pull the cable around as
it's both very high up in the air, as you can see by this netting we
rigged:
https://c4.staticflickr.com/4/3928/1...1032dcd7_c.jpg

And, the last redwood tree downhill itself is pretty gnarly, as shown
here looking up at the same netting but from the safety of the ground:
https://c2.staticflickr.com/6/5607/1...86936bcb_b.jpg